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1, 16, 152, 1120, 6972, 38368, 191968, 889184, 3862214, 15881616, 62275840, 234205472, 848652120, 2974133152, 10112507808, 33448941824, 107874784017, 339879773648, 1047953793136, 3166817754880, 9391718326404, 27366626142688, 78435144301696, 221322772710464, 615375631077094
(列表;图表;参考;听;历史;文本;内部格式)
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